• IDL and Input/Output
• File Information
• Opening Files with IDL_FileOpen()
• Closing Files with IDL_FileClose()
• Prevent File Closing - IDL_FileSetClose()
• Check File Status - IDL_FileEnsureStatus()
• Allocating and Freeing File Units
• Detecting End of File with IDL_FileEOF()
• Flushing Buffered Data
• Reading a Single Character - IDL_GetKbrd()
• Output of IDL Variables
• Adding to the Journal File - IDL_Logit()